11-26-2009, 11:56 AM
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#9 (permalink)
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Notebook Deity
Join Date: Sep 2007
Posts: 1,142
Rep Power: 15 
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Re: S-XPS 1645 AC Power Throttle Issue Investigation
Quote:
Originally Posted by eblock12
My laptop is suffering even worse. I just ran some tests myself, to compare with khaledseif's run. The only difference in hardware is I have the RGBLED display. I ran 3dmark06 and Crysis, but I got lazy and didn't do the full test matrix, only one battery test on Crysis. I think these results are blatant enough. Ran with every power policy on maximum performance.
3dmark06 (Using all defaults settings, just hit Run Test)
A/C adapter (laptop display @ full brightness)
5008 3dmarks
A/C adapter (laptop display off, external monitor)
6920 3dmarks
Then I ran the Crysis GPU benchmark (island flyover), which I think is a more realistic test. This is on all High settings, 720p, no vsync or AA. Again all power policies at maximum including ATI PowerPlay, etc.
A/C adapter (laptop display @ full brightness)
Play Time: 310.13s, Average FPS: 6.45
Min FPS: 0.36 at frame 85, Max FPS: 17.93 at frame 995
Battery (laptop display @ full brightness)
Play Time: 74.40s, Average FPS: 26.88
Min FPS: 6.30 at frame 145, Max FPS: 33.65 at frame 981
A/C adapter (laptop display off, external monitor)
Play Time: 77.43s, Average FPS: 25.83
Min FPS: 4.73 at frame 141, Max FPS: 33.08 at frame 874
Other notes: When running on the A/C adapter (with laptop display) the sound would make crackling noises in Crysis, also the display rate was much lower than the framerate (i.e. even though its 6 fps, it was showing 1 fps or less). Also despite the low performance the laptop was very cool (fan stayed on low at all times). Obviously there is some bottleneck when running the RGBLED at full brightness on A/C power.
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Thanks, Eblock12
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